I just photographed a model with prominent tattoos on her back shoulder blades, her comp card doesn't refer to the tattoos at all and I'm lucky because I had nothing to do with the selection of talent. In my opinion all the images of her with the outfit showing the tattoos can't be used. Not because of copyright but because they completely change the communication of the picture. I've watched art directors remove talent from scenes for a lot less. This model has basically ended her career in commercial modeling until she magically becomes famous. Its naive to think that a national fashion magazine isn't aware of each little element in a picture to allow a tattoo slip by. Or that ADs aren't aware, before a light stand gets put up, that additional costs such as high end retouching will eat into their budget and therefore won't even choose that talent in the first place.